How to upload image to server API with Flutter [duplicate] - flutter

Question

This question already has an answer here:
Upload image with http.post and registration form in Flutter?
(1 answer)
Closed 3 years ago.
I am new to Flutter development. My problem is that I try to upload the image but I keep getting failed request.
This piece of code is where I connect it with a server API which will receive the image file from Flutter. String attachment which consist of the image path that is passed from createIncident function located at another page.
Future<IncidentCreateResponse> createIncident( String requesterName, String requesterEmail,
String requesterMobile, String attachment, String title,
String tags, String body, String teamId,
String address ) async {
IncidentCreateResponse incidentCreateResponse;
var url = GlobalConfig.API_BASE_HANDESK + GlobalConfig.API_INCIDENT_CREATE_TICKETS;
var token = Auth().loginSession.accessToken;
var postBody = new Map<String, dynamic>();
postBody["requester_name"] = requesterName;
postBody["requester_email"] = requesterEmail;
postBody["requester_mobile_no"] = requesterMobile;
postBody["attachment"] = attachment;
postBody["title"] = title;
postBody["tags"] = tags;
postBody["body"] = body;
postBody["teamId"] = teamId;
postBody["address"] = address;
// Await the http get response, then decode the json-formatted responce.
var response = await http.post(
url,
body: postBody,
headers: {
'X-APP-ID': GlobalConfig.APP_ID,
"Accept": "application/json; charset=UTF-8",
// "Content-Type": "application/x-www-form-urlencoded",
HttpHeaders.authorizationHeader: 'Bearer $token',
'token': GlobalConfig.API_INCIDENT_REPORT_TOKEN
}
);
if ((response.statusCode == 200) || (response.statusCode == 201)) {
print(response.body);
var data = json.decode(response.body);
incidentCreateResponse = IncidentCreateResponse.fromJson(data['data']);
} else {
print("createIncident failed with status: ${response.statusCode}.");
incidentCreateResponse = null;
}
return incidentCreateResponse;
}
This is the code snippet where I get the image path from the selected image from the gallery
Future getImageFromGallery(BuildContext context) async {
var picture = await ImagePicker.pickImage(source: ImageSource.gallery);
setState((){
_imageFile = picture;
attachment = basename(_imageFile.path);
});
Navigator.of(context).pop();
}
This is the code where I passed the attachment string to the HTTP Response
this.incidentService.createIncident(
Auth().loginSession.name,
Auth().loginSession.email,
Auth().loginSession.mobile_no,
this.attachment,
this._titleController.text,
this._tags,
this._contentController.text,
this._teamId,
this._addressController.text
).then((IncidentCreateResponse res) {
if (res != null) {
print('Ticket Id: ' + res.id);
// Navigator.pop(context);
this._successSubmittionDialog(context);
} else {
this._errorSubmittionDialog(context);
}
}

Answer 1

You can upload image using multipart or base64 Encode.
For uploading image using multipart Visit the Official documentation
For uploading image using base64 Encode you can checkout the Tutorial Here
I suggest using multipart image upload as it is even reliable when your image or files are larger in size.

Answer 2

Hope this could help you,
create a function to upload your image after picking or clicking an image like,
Future<ResponseModel> uploadPhoto(
String _token,
File _image,
String _path,
) async {
Dio dio = new Dio();
FormData _formdata = new FormData();
_formdata.add("photo", new UploadFileInfo(_image, _path));
final response = await dio.post(
baseUrl + '/image/upload',
data: _formdata,
options: Options(
method: 'POST',
headers: {
authTokenHeader: _token,
},
responseType: ResponseType.json,
),
);
if (response.statusCode == 200 || response.statusCode == 500) {
return ResponseModel.fromJson(json.decode(response.toString()));
} else {
throw Exception('Failed to upload!');
}
}
then you can use use uploadImage,
uploadImage(_token, _image,_image.uri.toFilePath()).then((ResponseModel response) {
//do something with the response
});
I have used Dio for the task, you can find more detail about dio here
Add this to your package's pubspec.yaml file:
dependencies:
dio: ^3.0.5
Then import it in your Dart code, you can use:
import 'package:dio/dio.dart';

Answer 3

To upload image using multipart API use this code ie
Add this library dio in your project in pubspec.yaml file
dio: ^3.0.5
and import this in your class
import 'package:dio/dio.dart';
Declare this variable in your class like State<CustomClass>
static var uri = "BASE_URL_HERE";
static BaseOptions options = BaseOptions(
baseUrl: uri,
responseType: ResponseType.plain,
connectTimeout: 30000,
receiveTimeout: 30000,
validateStatus: (code) {
if (code >= 200) {
return true;
}
});
static Dio dio = Dio(options);
then use this method to upload file
Future<dynamic> _uploadFile() async {
try {
Options options = Options(
//contentType: ContentType.parse('application/json'), // only for json type api
);
var directory = await getExternalStorageDirectory(); // directory path
final path = await directory.path; // path of the directory
Response response = await dio.post('/update_profile',
data: FormData.from({
"param_key": "value",
"param2_key": "value",
"param3_key": "value",
"profile_pic_param_key": UploadFileInfo(File("$path/pic.jpg"), "pic.jpg"),
}),
options: options);
setState(() {
isLoading = false;
});
if (response.statusCode == 200 || response.statusCode == 201) {
var responseJson = json.decode(response.data);
return responseJson;
} else if (response.statusCode == 401) {
print(' response code 401');
throw Exception("Incorrect Email/Password");
} else
throw Exception('Authentication Error');
} on DioError catch (exception) {
if (exception == null ||
exception.toString().contains('SocketException')) {
throw Exception("Network Error");
} else if (exception.type == DioErrorType.RECEIVE_TIMEOUT ||
exception.type == DioErrorType.CONNECT_TIMEOUT) {
throw Exception(
"Could'nt connect, please ensure you have a stable network.");
} else {
return null;
}
}
}